/* =========================================================
   BORNEO GEO SERVICE
   Global Design System
========================================================= */

:root {
  --color-primary: #102a2e;
  --color-primary-dark: #091d20;

  --color-accent: #467f78;
  --color-accent-dark: #356760;

  --color-white: #ffffff;
  --color-background: #f6f8f7;
  --color-surface: #ffffff;

  --color-text: #172326;
  --color-text-muted: #637174;
  --color-border: #dce3e1;

  --container: 1200px;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 4px 18px rgba(9, 29, 32, 0.06);

  --shadow-md: 0 14px 36px rgba(9, 29, 32, 0.1);

  --transition: 180ms ease;
}

/* =========================================================
   Reset
========================================================= */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;

  font-family:
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    sans-serif;

  color: var(--color-text);
  background: var(--color-white);

  font-size: 1rem;
  line-height: 1.7;

  overflow-x: hidden;
}

img {
  display: block;

  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

h1,
h2,
h3,
h4,
p {
  margin-top: 0;
}

h1,
h2,
h3,
h4 {
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
}

h3 {
  font-size: clamp(1.15rem, 2vw, 1.5rem);
}

/* =========================================================
   Accessibility
========================================================= */

.skip-link {
  position: fixed;

  top: -100px;
  left: 1rem;

  z-index: 9999;

  padding: 0.7rem 1rem;

  color: white;
  background: var(--color-primary);

  border-radius: var(--radius-sm);
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* =========================================================
   Layout
========================================================= */

.container {
  width: min(calc(100% - 2rem), var(--container));

  margin-inline: auto;
}

.section {
  padding: 5.5rem 0;
}

.section-light {
  background: var(--color-background);
}

/* =========================================================
   Buttons
========================================================= */

.button {
  display: inline-flex;

  align-items: center;
  justify-content: center;

  min-height: 48px;

  padding: 0.8rem 1.3rem;

  border: 1px solid transparent;
  border-radius: var(--radius-sm);

  font-weight: 650;

  transition:
    background var(--transition),
    color var(--transition),
    border-color var(--transition),
    transform var(--transition);
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: white;
  background: var(--color-accent);
}

.button-primary:hover {
  background: var(--color-accent-dark);
}

.button-outline {
  color: var(--color-primary);
  background: transparent;

  border-color: var(--color-primary);
}

.button-outline:hover {
  color: white;
  background: var(--color-primary);
}

.button-light {
  color: white;

  background: rgba(255, 255, 255, 0.08);

  border-color: rgba(255, 255, 255, 0.4);
}

.button-light:hover {
  color: var(--color-primary);
  background: white;
}

/* =========================================================
   Header / Navbar
========================================================= */

.site-header {
  position: sticky;

  top: 0;

  z-index: 1000;

  background: rgba(255, 255, 255, 0.96);

  border-bottom: 1px solid var(--color-border);

  backdrop-filter: blur(12px);
}

.navbar {
  position: relative;

  display: flex;

  align-items: center;

  min-height: 78px;

  gap: 2rem;
}

.brand {
  display: flex;

  align-items: center;

  gap: 0.7rem;

  margin-right: auto;
}

.brand-logo {
  display: block;
  flex-shrink: 0;

  width: 44px;
  height: 44px;

  overflow: hidden;

  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 10px;
}

.brand-logo img {
  display: block;

  width: auto;
  max-width: none;
  height: 44px;
}

.brand-text {
  display: flex;
  flex-direction: column;

  line-height: 1.15;
}

.brand-text strong {
  font-size: 0.95rem;
}

.brand-text small {
  margin-top: 0.25rem;

  color: var(--color-text-muted);

  font-size: 0.68rem;
}

.main-nav {
  display: flex;

  align-items: center;

  gap: 1.5rem;
}

.main-nav a {
  position: relative;

  padding: 0.5rem 0;

  color: var(--color-text-muted);

  font-size: 0.92rem;
  font-weight: 550;

  white-space: nowrap;

  transition: color var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
}

.main-nav a.active::after {
  content: '';

  position: absolute;

  left: 0;
  right: 0;
  bottom: 0;

  height: 2px;

  background: var(--color-accent);
}

.nav-toggle {
  display: none;

  width: 42px;
  height: 42px;

  padding: 9px;

  background: transparent;

  border: 1px solid var(--color-border);

  border-radius: var(--radius-sm);
}

.nav-toggle span {
  display: block;

  width: 100%;
  height: 2px;

  margin: 4px 0;

  background: var(--color-primary);

  transition: var(--transition);
}